public async void Connect()
{
// Repair the device if needed
if (!devInfo.Pairing.IsPaired)
{
Debug.WriteLine("Pairing...");
DeviceInformationCustomPairing customPairing = devInfo.Pairing.Custom;
customPairing.PairingRequested += PairingRequested;
DevicePairingResult result = await customPairing.PairAsync(DevicePairingKinds.ProvidePin, DevicePairingProtectionLevel.None);
customPairing.PairingRequested -= PairingRequested;
Debug.WriteLine("Pair status: " + result.Status);
}
else
{
Debug.WriteLine("Already Paired");
}
// Get the actual device
try {
device = await BluetoothDevice.FromIdAsync(devInfo.Id);
device.ConnectionStatusChanged += ConnectionStatusChanged;
} catch (Exception ex) {
Debug.WriteLine("Bluetooth Not Available");
return;
}
//try {
var services = await device.GetRfcommServicesAsync();
if (services.Services.Count > 0)
{
var service = services.Services[0];
stream = new StreamSocket();
//try {
await stream.ConnectAsync(service.ConnectionHostName, service.ConnectionServiceName);
//} catch (Exception ex) {
//Debug.WriteLine("Could not connect to device");
//}
Debug.WriteLine("Stream Connected");
rx = new DataReader(stream.InputStream);
rx.InputStreamOptions = InputStreamOptions.Partial;
tx = new DataWriter(stream.OutputStream);
OnConnected();
}
/*} catch (Exception ex) {
* Debug.WriteLine("Failed to get services");
* return;
* }*/
}
private async void Button_Click_GetRfcommServices(object sender, RoutedEventArgs e)
{
BluetoothDevice bt = await BluetoothDevice.FromIdAsync(ViewModel.SelectedDevice.Id);
RfcommDeviceServicesResult result = await bt.GetRfcommServicesAsync();
foreach (var b in bt.SdpRecords)
{
Debug.WriteLine(Encoding.UTF8.GetString(b.ToArray()));
}
foreach (var service in result.Services)
{
Debug.WriteLine(service.ServiceId.AsString() + " " + service.ConnectionHostName + " " + service.ConnectionServiceName);
}
}
/// <summary>Get extra info for connection and other not gathered at discovery to save time</summary>
/// <param name="deviceInfo">The device information data model to populate</param>
/// <param name="forceRetrieve">Force re-reading of all extra information</param>
/// <returns>An asynchronous task result</returns>
private async Task GetExtraInfo(BTDeviceInfo deviceInfo, bool forceRetrieve)
{
this.log.InfoEntry("GetExtraInfo");
// 0 length remote host name indicates that we require more information for connection
if (deviceInfo.RemoteHostName.Length == 0 || forceRetrieve)
{
this.log.Info("GetExtraInfo", () => string.Format("Getting info to fill in host name for address:{0}", deviceInfo.Address));
using (BluetoothDevice device = await BluetoothDevice.FromIdAsync(deviceInfo.Address)) {
// TODO - defer this to before connection or info request
// SDP records only after services
// Must use uncached
RfcommDeviceServicesResult serviceResult = await device.GetRfcommServicesAsync(BluetoothCacheMode.Uncached);
this.log.Info("GetExtraInfo", () => string.Format("Success. Number of services:{0}", serviceResult.Services.Count));
//WrapErr.ChkTrue(serviceResult.Services.Count > 0, 9999, () => string.Format("No services for BT:{0}", deviceInfo.Name));
if (serviceResult.Services.Count == 0)
{
throw new Exception(string.Format("No services for BT:{0}", deviceInfo.Name));
}
if (serviceResult.Error == BluetoothError.Success)
{
foreach (var service in serviceResult.Services)
{
BT_ServiceType serviceType = BT_ParseHelpers.GetServiceType(service.ConnectionServiceName);
this.log.Info("GetExtraInfo", () => string.Format("Device {0} Connection host name {1} Service name {2} Type {3}",
deviceInfo.Name,
service.ConnectionHostName,
service.ConnectionServiceName,
serviceType.ToString()));
if (serviceType == BT_ServiceType.SerialPort)
{
// TODO get extra info on attributes
//var sdpAttr = await service.GetSdpRawAttributesAsync(BluetoothCacheMode.Uncached);
//foreach (var attr in sdpAttr) {
// this.log.Info("HarvestInfo", () => string.Format(" SDP Attribute:{0} Capacity:{1} Length:{2}", attr.Key, attr.Value.Capacity, attr.Value.Length));
//}
// Sample output. See: https://www.bluetooth.com/specifications/assigned-numbers/service-discovery/
//SDP Attribute id | Capacity | Length | Description(?)
// 256 7 7
// 0 5 5
// 6 11 11
// 4 14 14
// 1 5 5 (service class ID list
deviceInfo.ServiceType = BT_ServiceType.SerialPort;
deviceInfo.RemoteHostName = service.ConnectionHostName.ToString();
deviceInfo.RemoteServiceName = service.ConnectionServiceName;
// TODO info on access
//service.DeviceAccessInformation.CurrentStatus == DeviceAccessStatus.Allowed
this.log.Info("****", () => string.Format("Device:{0} Host Name:{1} Service:{2}",
deviceInfo.Name, deviceInfo.RemoteHostName, deviceInfo.RemoteServiceName));
}
else
{
// Not used.
}
}
}
else
{
this.log.Error(9999, () => string.Format("Get Service result:{0}", serviceResult.Error.ToString()));
}
}
}
}
/// <summary>Get extra info for connection and other not gathered at discovery to save time</summary>
/// <param name="deviceInfo">The device information data model to populate</param>
/// <param name="forceRetrieve">Force re-reading of all extra information</param>
/// <returns>An asynchronous task result</returns>
private async Task GetExtraInfo(BTDeviceInfo deviceInfo, bool forceRetrieve, bool display)
{
try {
this.log.InfoEntry("GetExtraInfo");
// TODO Cannot call this after the services have already been retrieved. So do not force
// 0 length remote host name indicates that we require more information for connection
if (deviceInfo.RemoteHostName.Length == 0 || forceRetrieve)
{
this.log.Info("GetExtraInfo", () => string.Format("Getting info to fill in host name for address:{0}", deviceInfo.Address));
using (BluetoothDevice device = await BluetoothDevice.FromIdAsync(deviceInfo.Address)) {
// TODO - defer this to before connection or info request
// SDP records only after services
// Must use uncached
RfcommDeviceServicesResult serviceResult = await device.GetRfcommServicesAsync(BluetoothCacheMode.Uncached);
this.log.Info("GetExtraInfo", () => string.Format("Success. Number of services:{0}", serviceResult.Services.Count));
//WrapErr.ChkTrue(serviceResult.Services.Count > 0, 9999, () => string.Format("No services for BT:{0}", deviceInfo.Name));
if (serviceResult.Services.Count == 0)
{
throw new Exception(string.Format("No services for BT:{0}", deviceInfo.Name));
}
if (serviceResult.Error == BluetoothError.Success)
{
foreach (var service in serviceResult.Services)
{
BT_ServiceType serviceType = BT_ParseHelpers.GetServiceType(service.ServiceId.AsShortId());
this.log.Info("GetExtraInfo", () => string.Format("Device {0} Connection host name {1} Service name {2} Type {3}",
deviceInfo.Name,
service.ConnectionHostName,
service.ConnectionServiceName,
serviceType.ToString()));
if (serviceType == BT_ServiceType.SerialPort)
{
//await this.GetListSDPAttributes(service);
deviceInfo.ServiceType = serviceType;
deviceInfo.RemoteHostName = service.ConnectionHostName.ToString();
deviceInfo.RemoteServiceName = service.ConnectionServiceName;
deviceInfo.ServiceClassName = serviceType.ToString().CamelCaseToSpaces();
deviceInfo.ServiceClassInt = (int)service.ServiceId.AsShortId();
// TODO info on access
//service.DeviceAccessInformation.CurrentStatus == DeviceAccessStatus.Allowed
this.log.Info("****", () => string.Format("Device:{0} Host Name:{1} Service:{2}",
deviceInfo.Name, deviceInfo.RemoteHostName, deviceInfo.RemoteServiceName));
//deviceInfo.Strength = 0;
this.ListDeviceInfoProperties(device);
this.log.Info("****", () => string.Format("device.BluetoothAddress: {0}", device.BluetoothAddress));
this.log.Info("****", () => string.Format("device.BluetoothDeviceId.id: {0}", device.BluetoothDeviceId.Id));
this.log.Info("****", () => string.Format("device.DeviceId: {0}", device.DeviceId));
this.log.Info("****", () => string.Format("device.DeviceInformation.Id: {0}", device.DeviceInformation.Id));
this.log.Info("****", () => string.Format("device.ClassOfDevice: {0}", device.ClassOfDevice.RawValue));
//this.log.Info("****", () => string.Format(":{0}", ));
//this.log.Info("****", () => string.Format(":{0}", ));
// Experimental. See the note on the method
//await this.GetRadioInfo(device, deviceInfo, service.ConnectionServiceName);
//await this.GetRadioInfo(device, deviceInfo, deviceInfo.RemoteHostName);
// List of radios available on current device
//await this.ListRadios();
if (display)
{
this.BT_DeviceInfoGathered?.Invoke(this, deviceInfo);
}
}
else
{
//Not used.
}
service.Dispose();
}
}
else
{
this.log.Error(9999, () => string.Format("Get Service result:{0}", serviceResult.Error.ToString()));
}
}
}
else if (deviceInfo.RemoteHostName.Length > 0 && display)
{
this.BT_DeviceInfoGathered?.Invoke(this, deviceInfo);
}
}
catch (Exception e) {
this.log.Exception(9999, "GetExtraInfo", "", e);
}
}
public async Task <bool> BtConnect(string deviceID)
{
try
{
//System.Diagnostics.Debug.Assert(Thread.CurrentThread.IsBackground, "SerialComm:BtConnect() cannot be called from the UI thread.");
DeviceAccessStatus accessStatus = DeviceAccessInformation.CreateFromId(deviceID).CurrentStatus;
if (accessStatus == DeviceAccessStatus.DeniedByUser)
{
//await OBD2Xam.MainPage.Instance.DisplayAlert("Error",
// "This app does not have access to connect to the remote device. Please grant access in Settings > Privacy > Other Devices.",
// "Cancel");
await Xamarin.Forms.Device.InvokeOnMainThreadAsync(
() => { OBD2Xam.MainPage.Instance.DisplayAlert("Error",
"This app does not have access to connect to the remote device. Please grant access in Settings > Privacy > Other Devices.",
"Cancel"); }
);
return(false);
}
BluetoothDevice device = await BluetoothDevice.FromIdAsync(deviceID);
if (device == null)
{
//rootPage.NotifyUser("Bluetooth Device returned null. Access Status = " + accessStatus.ToString(), NotifyType.ErrorMessage);
System.Diagnostics.Debug.WriteLine("Bluetooth Device returned null. Access Status = " + accessStatus.ToString());
System.Diagnostics.Debugger.Break();
return(false);
}
//System.Diagnostics.Debug.WriteLine(device.ConnectionStatus);
DeviceAccessStatus das;
das = await device.RequestAccessAsync(); // might not always work...
//System.Diagnostics.Debugger.Break();
/*
* // RequestAccessAsync() needs to executed on the UI thread, which means the UI thread cannot be blocked
* // while waiting for all this other crap to run. So this code needs to be executed in backround,
* // WITHOUT an await, because that would cause the UI thread to block.
* bool invokeComplete = false;
* Xamarin.Forms.Device.BeginInvokeOnMainThread( async () => {
* das = await device.RequestAccessAsync();
* invokeComplete = true;
* });
*
* // now we wait for the UI thread to finish it's task, without await
* // because BeginInvokeOnMainThread() isn't awaitable.
* while (!invokeComplete)
* {
* System.Diagnostics.Debug.WriteLine("waiting...");
* System.Threading.Thread.Sleep(100);
* }
*/
if (das == DeviceAccessStatus.Allowed)
{
RfcommDeviceServicesResult rfResultList = await device.GetRfcommServicesAsync().AsTask().ConfigureAwait(false);
logRfTypes(rfResultList);
// https://blog.j2i.net/2018/07/29/connecting-to-bluetooth-rfcomm-with-uwp/
if (rfResultList.Services.Count > 0)
{
foreach (var service in rfResultList.Services)
{
if (service.ServiceId.AsString() == Constants.BT_SERIAL_PORT_INTERFACE)
{
streamSocket = new StreamSocket();
await streamSocket.ConnectAsync(service.ConnectionHostName, service.ConnectionServiceName);
dw = new DataWriter(streamSocket.OutputStream);
sr = new StreamReader(streamSocket.InputStream.AsStreamForRead(256));
break;
}
}
if (!IsOpen())
{
throw new Exception("Service not found)");
}
}
}
}
catch (Exception exc)
{
if (exc.Message == "Element not found. (Exception from HRESULT: 0x80070490)")
{
//System.Diagnostics.Debug.WriteLine("Device not listening.");
await Xamarin.Forms.Device.InvokeOnMainThreadAsync(
() => { OBD2Xam.MainPage.Instance.DisplayAlert("Error", "Device not listening.", "Cancel"); }
);
this.Close();
}
else
{
System.Diagnostics.Debug.WriteLine(exc.Message);
System.Diagnostics.Debugger.Break();
}
}
return(IsOpen());
}
